Apparatus for the pneumatic control of milking-pulsators.



T. T. SABROE. APPARATUS FOR THE PNEUMATIC CONTROL OF MILKING PULSATORS.

APPLICATION FILED DEC. 22, 1910.

Patented Aug. 19, 1913.

two ditl'ercnt UNITED STATES PATENT OFFICE.

THOMAS rnomAssEN SABROE, or COPENHAGEN, DENMARK.

Specification of Letters Patent.

. Patented A1i .19,,1913.v

Application filed December 22, 1910. Serial No. 598,850.

To all whom it may concern.

lle it known that I, THOMAS TIIoMAssnN Salmon, a citizen of the Kingdom of Den mark, residing in Copenhagen, in said Kingdom, have invented certain new and useful Improvements in Apparatus for the Pneumatic Control of Milking-Pulsators, of which the following is a specification.

The controlling of the valves in milkingpulsators is generally effected by means of a diaphragm, a piston or the like alternately sub ected to two difi'erent pressures, for instance vacuum and air-pressure. The intermittent production of these two pressures has hitherto been obtained by means of a slide which during one period, for example, breaks off the vacuum-connection with the working-chamber and at the same time opens, for example, the air-connection, while it during the other period opens for the vacuum-connection and breaks off the airconnection.

The improved construction consists of a pneumatically controlled milking pulsator which comprises a working-chamber, a diaphragm in said working-c nber, said dia phragm bein connected with the controlling device of the teat-cups, pipes connecting the working-chamber with the suction and atmosphere respectively for giving access of pneumatic working-pressures to the working-chamber, and a controlling device by which one of said pipe-connections is regulated pressure-medium therein to the workingchamber alternately interrupted while the access of the other pressure-medium is always left uninterrupted.

In the following reference will be made to the accompanying drawing where:

Figures 1 and 2 show the above mentioned hitherto known controlling-arrangement, and Figs. 343 are constructional forms of my improved controlling-arrangement.

Similar letters of reference indicate the same parts in the difi'erent figures of the drawing.

By the hitherto known controllingarrangement the working chamber 2 is dur ing the one period, Fig. 1, for instance, con nected with the suction-pipe 3 through the chamber 1 of the slide. The working-chambcr is therefore evacuated in .the direction of the dotted arrow 4, and the diaphragm 5 is raised. During the other suction-pipe 3 is shut oil", and the chamber 1 and the access of the pneumatic,

period, Fig. 2, the

is at the same time opening 6 which was closed during the first period. The workingchamber is consequently filled with air which is drawn in in the direction of the fully drawn arrow 7, and the diaphragm is lowered. The diaphragm 5 is connected in the usual manner by a rod 10 with the controlling-device of the teat-cups. Although this controlling arrangement, theoretically considered, is correctly constructed, it has however, in practical use several drawbacks, which are due to the slide which is obliquely actuated, owing to the simultaneous presence of the two pressures. When, as will be the case frequently in practice, as working-agent during one period air of ordinary pressure, and durin the other period, air of a lower pressure (vacuum), is used, the aforesaid uneven pressure on the valve and the conse quent wear and'leaking of the same is objectionable, as the power presentduring the one period is gradually decreased, so that the working of the pulsator is ultimately completely interrupted. Further, by this known cont-rolling-arrangement the rather important mutual regulation of the speed of the working-member or the pulsating-valve in the one direction and in the other by mutual regulation of the two Working-agents, that is to say by an increase of the suctioneffect in the working-chamber during a simultaneous decrease of the pressure-efi'ect, or vice versa, can either not be obtained at all or only by rather complicated-means. At-

decreasing or increasing the diameter of a single opening or duct. In the arrangement known, Figs. 1 and 2, there is one connection common for both working-agents, the duct 8, through which the air, as indicated by arrows, alternately passes in the one direction or in the other. By decreasing or widening the opening of this duct bot-h periods are prolonged or shortened to the same extent, but are not regulated in regard to each other.

, By the present invention the working is simplified, and the reliability and effectiveness are increased by the provision that one of the two working-agents (air of low, ordinary or high pressure) has constantly free access to the working-chamber, while only the access of the other working-agent is controlled, z'. e. is established and broken ofl".

In Figs. 3 and 4 the working-chamber 2 is connected with the air any rate, it cannot be obtained by merely in constant open connection with the suction-pipe 3, while for instance the air-passage is alternately closed and opened. In Figs. 5 and 6 the reverse is the case. In the one period, Fig.- 3 (and 6), thereis in the chamber will in the first period, or at leasttoward its finish, be brought down almost to this pressure. The other working-agent is for instance the outer air whose pressure may be fixed at a mercury-column of say 7 6 cm. When this air is admitted to the working-chamber 2, Fig. 4, the pressure will increase, and by a suitable choice of the size of the access channel in relation to the size of the vacuum channel 8 it may easily be obtained that an effective pressure is produced during this period and sufiiciently great, either by itself or in known manner assisted by the weight of the working member, to make this latter one perform a movement opposite that which it performed during the revious period. By regulating the openmg of the duct or channel 8 or 9 which is accomplished by the slide-valve and the regulation of the stroke of the same, it becomes possible at will to make the movement in the one period, no matter which onefltake place quicker than in the other one. Thus the working of the slide becomes more simple and more reliable. slide is merely the same as that of an ordinary cock or valve, and it may if desirable The function of the be suflicient touse such a cock or Valve suitably-actuated from the working-member or the pulsator-valve; ora slide of a suitable kind may be used which is only influenced by one of the working-agents.

1. In apneumatically-controlled milkingpulsator, the combination of a workingchamber, a diaphragm in said workingchamber connected with the controlling device of the teat-cups, a suction-pipe, pipes connecting the working-chamber with the suctlon-plpe and atmosphere respectively for giving access of two different pneumatic pressures to the working-chamber, and a controlling device for said pipe-connections by which one of the pipe-connections is regulated and the access of the pneumatic pressure-medium to the working-chamber is alternately interrupted while the access of the other pressure-medium is always left uninterrupted.

2. In a pneumatically-controlled milkingpulsator, the combination of a workingchamber, a diaphragm in said chamber, said dia hragm. being connected with the contro ling device of the teat-cups, a suctionpipe, a pipe connecting the working-chamher with the suction-pipe, a second pipe connecting the working-chamber with the atmosphere, and a controlling device for said pipe-connections for alternately subjecting the working-chamber to the action of the suction-pressure and the atmospheric pressure.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

THOMAS THOMASSEN SABROE.v Witnesses:

P. Herman BANG, AXEL PERMIN. 

